Introduction to Languages for Scientific Computing, winter semester 14/15: Final Exam
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1 Introduction to Languages for Scientific Computing, winter semester 14/15: Final Exam Lecture given by: Paolo Bientinesi First exam, The following document is a transcript from memory created by some students. There is no guarantee for correctness or completeness. Especially concrete values may differ. However, the conceptual design should be correct. Please notice that this document is not published by any member of professor Bientinesi s group. 1) Floating point arithmetic 1.1) [6 points] Consider the following floating point arithmetic with normalization: 1. What is a = fl(12.34)? β = 2, t = 4, e min = 5, e max = What is the absolute and relative representation error of a? 3. What is b = fl(0.321)? 4. What is the absolute and relative representation error of b? 5. What is c = fl(a + b)? 6. What is the absolute and relative representation error of c? (One point each). 1.2) [2 points] Consider single and double precision arithmetic with normalization: β = 2, t = 24, e min = 125, e max = 128, β = 2, t = 53, e min = 1021, e max = How many double precision numbers are between two consecutive single precision numbers (i.e. how many d j s in ]s i, s i+1 [)? 1
2 2) Matlab 2.1) [2 points] A =[2 0;0 2]; B =[1 2; -3 4]; M = A *B v ([ ]) = [M(1,:),M (2:)] 2.2) [3 points] 1. sin(pi) 2. 2^ == 2^54 3. r = rand; s = single(r); t = double(s); s == t 2.3) [4 points] Write a function that takes a vector of size 3n and returns I n I n 0 I n 0 I n v I n I n 0 without constructing the matrix, or I n. 2.4) [3 points] Write a recursive program that constructs H n : n n n n n n n n 1 n 1... n 1 n 1 n n 1 n 2... n 2 n 2 H n = n n 1 n n n 1 n n n 1 n ) Mathematica The constructs For, While, Do, Table and If are forbidden. 2
3 3.1) [2 points] Explain the following expression f[x, n_integer ];/ Length [{x] >n -> g[x] 3.2) [3 points] Map [ {#[[1]][#[[2]]], #[[1]][2]#[[2]], #[[2]]#[[1]][#[[1]][1]], {{#^2-1&, 2,{(# -1)(#+1)&, -2 ] 3.3) [4 points] Write a function H[i,j,n] that returns the (i, j)-entries of H n as in 2.4 with bound checks. If out-of-bounds or no integer: return NaN. 3.4) [2 points] C A B D Function ABC as follows: in A (circle size 1 around (0,0), incl. borders): x 2 + y 2 in B (circle size 2 around that, incl. outer borders):cos x 2 + y 2 in C (outside circle): 0 in D (outside circle, lower left quarter): π Define function ABC. 3
4 3.5) [5 points] Captian Kirk wants to find the roots of sin (x 2 ).2.3 in [0, π]. FindRoots takes an equation and a tuple of the form {variable, initial guess and returns one solution in the form {variable->value. Help him follow these steps: 1. Define f. 2. Apply FindRoots for initial guesses given by Table[i,{i,-.2,4,.2]. 3. Filter those results outside the range. 4. Merge results which are almost equal. 5. Plot the function as shown in figure... (Function + Dots at every root). 4) C 4.1) [5 points] Leia successfully compiles the following program: # include < stdlib.h> # include <stdio.h> void function ( int * arr, int n){ int idx, current,i,j,tmp ; for (i = 0; i < n; i ++) { current = -1; idx = -1; for (j=i; j < n; j ++) { if ( arr [j] > current ) { current = arr [j]; idx = j; printf (" iter :%d\ tidx :%d\n", i, idx ); tmp = arr [ idx ]; arr [ idx ] = arr [i]; arr [i] = tmp ; 4
5 int main ( int argc, char * argv []) { int i, n = 6; int * arr = ( int *) malloc (n* sizeof ( int )); for (i =0; i < n; i ++) { arr [i] = (7* i +2) % 5; function (arr, n); printf ("["); for (i = 0; i < n; i ++) { printf ("%d ", arr [i ]); printf ("]"); return 0; 1. What is the output of the program? 2. What is generally computed by function? 3. If for (i = 0; i < n; i++) is replaced with for (i = 0; i < n-1; i++), would the output differ? Why? 4. If for (j = i; j < n; j++) is replaced with for (j = i+1; j < n; j++), would the output differ? Why? 4.2) [3 points] The Princess wants to make calculations with the class of matrices P n. Construct lower-triangular matrix P (i, j) = i+j ij+1 for i < j, 0 else. Ensure that it is stored by columns. # include < stdlib.h> # include <stdio.h> int main ( int argc, char * argv []) { int n; if( argc >1) n= atoi ( argv [1]); // your code 5
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